the process done in a petri dish is growth factors that mimics the environment. it is not always a precise science. >> you know, my weekends sometimes would hinge on whether i came in and sold beating cells or not. >> wons they had enough of the beating cells they began watching them as they grew and developed painstakingly extracting their dna and cataloging the genetic changes, a process made possible only by the development of powerful new gene sequencing technology. >> the human genome that was announced cost $3 billion to sequence one individual's dna. and now we can do the same person's dna in a week for $3,000. >> still it took massive networks of computers to organize the data into a color coded genetic blueprint detailing the creation of a heart cell. while having a genetic heart cell macon jury them up, they may be repairing them or heading off birth defects in babies before they are even born. >> we potentially could. part of the attraction to understanding this blueprint, especially this type of blueprint is that it is very aminable -- amenable. >> th